船用锅(guo)炉(lu)水(shui)(shui)位(wei)(wei)计应(ying)有指示zui高(gao)、zui低(di)安(an)全(quan)水(shui)(shui)位(wei)(wei)和正常水(shui)(shui)位(wei)(wei)的明显标志。水(shui)(shui)位(wei)(wei)表的水(shui)(shui)位(wei)(wei)zui低(di)显示位(wei)(wei)置与锅(guo)炉(lu)的zui低(di)工作水(shui)(shui)位(wei)(wei)高(gao)度相一致，但对水(shui)(shui)管锅(guo)炉(lu)，应(ying)位(wei)(wei)于zui低(di)工作水(shui)(shui)位(wei)(wei)以(yi)下50mm处。水(shui)(shui)位(wei)(wei)计的下部可见(jian)边缘(yuan)应(ying)比(bi)zui高(gao)火界至少高(gao)50mm，且(qie)应(ying)比(bi)zui低(di)安(an)全(quan)水(shui)(shui)位(wei)(wei)至少低(di)25mm，水(shui)(shui)位(wei)(wei)计的上部可见(jian)边缘(yuan)应(ying)比(bi)zui高(gao)安(an)全(quan)水(shui)(shui)位(wei)(wei)至少高(gao)25mm。